A frame from a video shows the moment just before shots rang inside a Richmond church in 2008. (CBS)

MARTINEZ (CBS SF) – A Richmond man was sentenced Friday morning to 40 years to life in prison for a gang-related shooting in 2010 in a church during Valentine’s Day services that critically injured two teens.

Judge John W. Kennedy said in a Martinez courtroom Friday that Marcel Buggs, 20, showed a “lack of concern for the lives of human beings” when he fired several rounds inside the New Gethsemane Church of God in Christ in Richmond—“the last place on earth where people expect to be murdered”.

On Feb. 14, 2010, Buggs, then 18, entered the church at 2100 Roosevelt Ave. armed with a handgun and a premeditated plan to shoot a rival gang member who was there.

But Buggs, who was with two other teens, ended up shooting the man’s two younger brothers, a 19-year-old and 14-year-old, Deputy District Attorney Aron Deferrari said.

Three people who witnessed the shooting identified Buggs as the shooter, Deferrari said.

During the trial, the defense argued that Buggs was not a gang member and had been misidentified because of a YouTube video in which he wielded a gun and talked about hurting North Richmond residents.

Defense attorney Diana Garrido told the judge Friday that imposing a life sentence on Buggs would be “cruel and unusual punishment.”

She also sent the court a letter describing her clients’ difficult upbringing living with an abusive father in a tough Richmond neighborhood where violence was the norm.

In the letter, Garrido writes that at 17, Buggs was diagnosed as bipolar and that he experienced hallucinations and was paranoid that “people were out to get him.”

Friday morning, Buggs’ mother, sister and the mother of his 2-year-old daughter addressed the judge and requested a lenient sentence.

All said that Buggs was an intelligent, creative young man whose family, including two young daughters, love him and are waiting for his return home.

“I’m begging you for leniency for my son, because he is saveable … he just needs someone to help him, because I didn’t know how,” Buggs’ mother Stacey Porter told the judge Friday morning while weeping.

The defendant, wearing a yellow jumpsuit, dabbed his eyes and nose with a tissue as his mother spoke, bowing his head down.

Kennedy said Friday that he balanced his ruling with information about the defendant’s difficult upbringing and psychological problems.

(Copyright 2011 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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